Problems writing to a Modbus RTU device

[BobB]

I currently use the PMCR function and the Protocol Macro file in the download section for reading from Modbus RTU devices - works very well. On a current job I have to write information to a Modbus RTU device and have used the same Protocol Macro file and the PMCR function but it does not appear to work properly. I have to write a 32 bit signed integer to the device and the PMCR function will not allow me to do this. Additionally I have to write to holding registers (40) and it appears to me that the Protocol Macro probably writes to read/write registers (30) but I am not sure. There appears to be no way to enter a 40 address into the equation. I have also had a look at the Modbus FBs from the French Omron website and he same sort of result. Has anyone been able to write a signed, 32 bit integer into hold registers in a Modbus RTU device with either of these methods or another method? I am currently reading 4 blocks from the Modbus RTU device without issue.